Microchip Technology 24FC1026T-I/ST

Overview

24FC1026T-I/ST from Microchip Technology is a 128K × 8 (1024 Kbit) I²C-compatible serial EEPROM with 1 MHz maximum clock frequency, 1.8V–5.5V supply range, and industrial temperature rating (–40°C to +85°C). It features 128-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity-used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24FC1026T-I/ST datasheet, 24FC1026T-I/ST pinout, 24FC1026T-I/ST application, or 24FC1026T-I/ST equivalent, key selection criteria include its 1 MHz I²C speed at V_CC ≥ 2.5V, 5 µA standby current, 450 µA read current, 3 ms typical page write time, and SOIC-8 package compatibility with legacy 24AA/24LC designs.

Technical Context

The 24FC1026T-I/ST implements a two-wire I²C slave interface with fixed 4-bit control code (1010b), user-configurable A1/A2 address bits enabling up to four devices on one bus, and B0 block select bit for accessing two 512 Kbit memory segments (00000h–0FFFFh and 10000h–1FFFFh). Its internal address pointer supports sequential reads within each segment.

It uses on-chip high-voltage generation for EEPROM programming, self-timed erase/write cycles, and slope-controlled outputs to suppress ground bounce. Write protection is sampled at the Stop bit, and the device responds only when the polled control byte matches the initiating write command during acknowledge polling.

Key Specifications

Pinout & Package

24FC1026T-I/ST is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm body width, RoHS-compliant matte tin finish, with standard 1.27 mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24LC1026-I/ST, the 24FC1026T-I/ST delivers 2.5× faster writes and 1.8V compatibility; versus AT24C1024-SSHL-T, it offers larger page buffer and native dual-segment addressing - both advantages for configuration-intensive embedded systems.

Availability

24FC1026T-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart energy meter firmware staging requiring stable component supply across extended production lifecycles.

Supply support for 24FC1026T-I/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and nonvolatile memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC1026T-I/ST belongs to Microchip's 24XX1026 family of high-density I²C EEPROMs, engineered for low-power, noise-immune data storage in space-constrained industrial and medical electronics.

FAQ

What is the maximum I²C clock frequency supported by the 24FC1026T-I/ST?

The 24FC1026T-I/ST supports up to 1 MHz I²C clock frequency when V_CC is 2.5V or higher. At 1.8V ≤ V_CC < 2.5V, the maximum clock is 400 kHz. This dual-speed capability allows the 24FC1026T-I/ST to operate efficiently across both modern low-voltage microcontrollers and legacy 3.3V/5V systems without sacrificing throughput.

How does the WP pin function on the 24FC1026T-I/ST?

The WP (Write-Protect) pin on the 24FC1026T-I/ST is sampled at the Stop bit of each write command. When tied to VCC, it disables all write operations (byte and page) while permitting unrestricted reads. When tied to VSS, writes are enabled. The 24FC1026T-I/ST acknowledges write commands even with WP active, but no data is stored - a behavior confirmed in DS20002270E Section 6.3.

What is the page size and write buffer capacity of the 24FC1026T-I/ST?

The 24FC1026T-I/ST has a 128-byte page write buffer and enforces strict physical page boundaries aligned to 128-byte offsets (e.g., 0000h–007Fh, 0080h–00FFh). Page writes crossing these boundaries wrap within the current page instead of advancing to the next - a constraint explicitly documented in DS20002270E Section 6.3 and critical for reliable firmware implementation.

Does the 24FC1026T-I/ST support sequential reads across its full 1024 Kbit memory?

No. The 24FC1026T-I/ST divides its memory into two 512 Kbit segments (00000h–0FFFFh and 10000h–1FFFFh), and sequential reads are limited to within each segment. Crossing segment boundaries requires issuing a new random read command. This architecture is defined by the B0 block select bit and verified in DS20002270E Sections 5.0 and 8.3.

What package type and lead finish does the 24FC1026T-I/ST use?

The 24FC1026T-I/ST uses an 8-lead SOIC package (3.90 mm body width) with matte tin (Sn) lead finish, compliant with RoHS Directive 2011/65/EU. Package marking includes "24FC1026", temperature grade "I", and date code - consistent with Microchip Drawing No. C04-018D and DS20002270E Section 9.1.